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Electrical Machines

Electrical Machines
In synchronous motor the torque is proportional to

 1/P
 Power P
 1/P²
 P²

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  provide starting torque only.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 100W
 40W
 80W
 60W

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 +3%
 -3.33%
 -3%

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
  0 Volt.
 1600 Volt.
 2000 Volt.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 40 A.
 400 A.
 44 A.

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